Contractible core-bar.



N0. 718,700. PATENTED JAN. 20,1903

c; E. CROSBY & E. c. AURIN.

GONTRAGTIBLE GORE BAR.

APPLICATION FILED MAR. s, 1902.

no MODEL. 2 SHEETS-SHEET 1.

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ATTORNEY.

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No. 718,700. PATBNTE'D'JAN. 20; 190's.-

0. E. CROSBY & E. c.- AURIN.

GONTRAGTIBLE GORE BAR.

APPLICATION FILED HA3. 3, 1902.

2 SHEETS-SHEET 2."

E0 MODEL.

INVENTORIS; Giana: E C7005 ATTORNEY.

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THE NORRIS sirens co., PHQTB-UTMO.. WASHINGTON, u. c.

llNTTnn STATES PATENT OFFICE.

CHARLES E. CROSBY AND EMIL O. AURIN, OF INDIANAPOLIS, INDIANA.

CONTRACTIBLE CORE-BAR.

SPECIFICATION forming part of Letters Patent No. 718,700, dated January20, 1903.

Application filed March 3, 1902. Serial No. 96,396. (No model.)

To all whom it may concern:

Be it known that we, CHARLES E. CROSBY and EMIL O. AURIN, citizens ofthe United States, residing at Indianapolis, in the county of Marion andState of Indiana, have inven ted new and useful Improvements inContractible Core-Bars; and we do declare the following to be a full,clear, and exact description of the invention, reference being had tothe accompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

Our invention relates to core bars or barrels of the type that may becontracted dia metrically for withdrawal from the pipes or hollowcylinders in which they may have been used in casting or forming thearticles, a bar being the skeleton frame of the 10am core proper againstwhich the internal face of the pipe or article may be formed and adaptedto be contracted quickly, if required, in order to permit the casting tocontract while cooling.

The principal object of our invention is to generally improve core-barsof this character in the details of construction, so that they may besimple and; inexpensive in first cost, not liable to derangement in use,efficient, and economical.

Another objectv is to provide a contractible core-bar that may beadapted to be readily a1- tered or changed in diameter, so that a savingin expense may be effected in the matter of equipment of foundries; andanother object'is to provide a bar of this character that may be compactand freely handled without becoming loose and detrimental to the loamcore and the casting.

The invention consists of a sectional or segmental shell composed ofcontiguous parts having joint-faces that are in planes tangential to theperiphery of the shell, means whereby a plurality of opposing segmentsmay be caused to move toward and from the center of the bar at a greaterrate of speed than the remaining segments, so that the joint-faces maycontinue in contact during movements, improved means whereby thesegments may be operated simultaneously; and, the invention alsoconsists in the parts and in the combination and arrangement of parts,as hereinafter particularly described and claimed.

Referring to the drawings, Figure l is a front view of the upper end ofthe bar as when in use, the imaginary circle indicating the usual loamcoating; Fig. 2, a front view of the lower end of the bar as whencontracted; Fig. 3, a central longitudinal sectional view of the bar,the middle portions of which are broken away; Figs. 4, 5, 6 and 7,detail views of detached parts; Fig. 8, a plan view of the smaller endof one of the members, which we term a spider, for operating the shellof the bar; Fig. 9, a plan view of the inner side of one'of theshell-segments; Fig. 10, a central longitudinal sectionalviewof the baras when contracted and showing minor modifications in several featuresthereof, the middle parts being broken away; Fig. 11, a fragmentary viewof the operating shaft or bar and other parts, showing modifications informs; Fig. 12, a plan view of the larger end of one of the spiders;Fig. 13, a plan View of one of the webs that form connections betweenthe operating-shaft and the shell, and Figs. 14 and 15 show the webcomposed of two parts.

Similar reference characters in the several figures of the drawingsindicate corresponding parts.

Incarrying out our invention practically we employ an operating-shaft A,which serves also as a medium for suspending the bar in verticalpositions and may also serve as the axle on which to rotate the bar inhorizontal positions. This shaft may be variouslyformed and the coactingpart-s adapted thereto, as illustrated in Figs. 3, 10 and 11, as will bedescribed hereinafter, and it will be Obvious that other modificationsmay be suggested to the constructor.

Referring more particularly to Fig. 3 it will appear that the shaft Ahas a screw-thread extending substantially the whole length of theshaft, the upper end of which has an eye a, or a and the lower end ofwhich has a squared part b for the purposes, respectively, of suspendingand operating the shaft. Two or more webs, depending on the length ofthe bar, as B and B, substantially alike, have screw-threads in theirhubs and are mounted on the shaft A, the end Web 13' having the longerhub, the end of which is suitably adapted to be held by a wrench or alever while the shaft may be rotated. Of

course it will be clear that we may employ suitable equivalent devicesin lieu of the continuous threads above referred to, whereby the websmay be moved along the shaft for contracting the shell. At suitablepoints on the shaft A are collars d d, correspondingin number to thewebs employed, that are secured to the shaft, preferably in anadjustable manner, by set-screws, the collars being threaded in theirbores to suit the shaft. Spiders C G, in suitable number, all alike,have smooth bores and are mounted rotatively on the shaft A against thecollars above described, and other similar, but preferably smaller,collars e e are secured at the opposite ends of the spiders to the shaftA, so that the spiders cannot move longitudinally on the shaft. Theshell comprises oppositelydisposed like main segments D and D, havingjoint-faces f, whose planes are oblique or inclined to the radii of theshell, substantially as shown in Fig. 2, in which imaginary linesindicate therelative position of the loam covering of the core-bar. Theshell also comprises oppositely-disposed like filling-segments E and E,differing somewhat from the other segments in that they are narrower andhave their joint-faces g disposed outwardly oppositely to theinwardly-disposed facesf. The narrower segments are designed to movemore rapidly than the broader segments, as will be understood. Eachsegment has a suitable number of spreaders F F secured at the innersides thereof, the number depending upon the length of the bar, and ofsuitable length to correspond with the diameter of the bar and that ofthe spiders, and the segments have perforations 7t and may also havereinforcingribs, as is usual in large sizes of bars.Thespreadersmaybevariously formed, those shown being ratherillustrativethan arbitrary. They may be attached either integrally or detachably tothe segments. The webs B B bear against the spreaders, and in some casesthe webs may have rims i, so as to reach about the spiders, and also insome cases the webs may have lugsj to extend between the spreaders, sothat the webs may not rotate relatively to the shell. Lugs G aresecured, as by bolts 7c, tothe segments against the faces Z of the webs.Therefore the webs cannot move longitudinally of the shellindependentlythereof, the spreaders and the lugs operatively connecting the webs withthe shell.

The spiders C C are adapted in a suitable manner to and engage thespreaders, both for holding the shell'segments in their proper normalpositions and for drawing the segments inwardly when contracting thebar. In the present case the spiders comprise hubs having smooth boresand arms 1 1 2 2 extending radially from the hub, the arms beingsubstantially T shape in cross-section, the extremities of which arewedge-like or inclined bearing-faces Z, and the faces Z of the arms 1 1have a greater inclination than those on the arms 2 2, as .will beobserved in Figs. 8 and 12 by noting the variations from the imaginarycircles.

The spreaders F are attached to the segments D and D and are alike, andthe spreaders F are attached to the segments E and E and are alike andsimilar to the others, each having a slot corresponding to a T-shapedarm of the spider and having an inclined bearing-face m, faces 19 toengage the under sides of the T-shaped part of the arm, and an extremityface a parallel to the other faces to engage a face q of the spider-hub.The opposing spreaders F F have the faces on n p inclined more than thecorresponding faces of the spreaders F F and agree with the coactingfaces of the arms 1 1.

By reference to Fig. 10 it will be seen that in the construction shownthe collars d and e may be dispensed with, the webs B B being providedwith screw-threads in their bores, fitting to the threads on the shaftA, which, for descriptive purposes, may be supposed to be divided intosections 3 4c 5 6 of different characters. The section 3, on which isthe threaded Web B and the section 4, on which is the threaded spider O,are of the same diameter, which is greater than that of the end sections5 and 6. The section 5, on which is the threaded spider G has the threadpitch corresponding to the pitch of the thread on the section 4, and thethread pitch on the section 3 and in the web B corresponds to the threadpitch on the section 6 and in the Web B. The spreaders in thisillustration extend along the segments a relatively greater distancethan those in Fig. 3, whereby the rims i on the webs may be dispensedwith. It will be seen also that the spider G has a hub extending beyondthe end of the shell like the hub of the web B, which is an advantage inthe larger sizes of bars. In Fig. 10 are shown screw-studs 1", that aresecured to the shell-segments in lieu of the lugs G and may be mostconveniently used in some cases as equivalents. These studs may also beinserted loosely in radial bores 5, (indicated by dotted lines,) inwhich case the lugsj will not be required, as will be obvious.

In Figs. l1, l4, and 15 the shaft-section 5 has a greater diameter thanthe section 3, in which case the web B is formed in halves, having lugs15 and connecting-bolts in order to connect the web with the shaft onthe smaller section 3. The remaining parts, not specifically mentionedas particular to Figs. 10 and 11, are substantially like thecorresponding parts in the other views of the drawings.

In designing the details We may obviously adopt various equivalentdevices whereby to cause the filling-segments to move more rapidly thanthe main segmentssuch, for instance, as cams or segments of eccentricsand the like mechanismsand the spider-arms may be slotted, while thespreaders are T shape within the scope of our invention.

IIO

In practical use the operating-shai' t is to be rotated in order toexpand the shell to its normal diameter, when the loam may be applied inthe usual manner. The complete core and its center or core bar may behandled and set according to the usual custom. After making the cast theshaft may be rotated in the opposite direction, which will cause thespiders to move relatively to the spreaders longitudinally of the barand the contact-faces of the spreaders,and the T-arms will draw thesegments toward the shaft, and two of the arms and spreaders having thefaces inclined more than the other two, the filling-segments beingconnected with them, will move more rapidly than the main segments. Thusthe filling-segments will move out of the path of the main segments andpermil the latter to move, the joint faces of the segments havingsliding contact, although such close adjustment may not be essential,provided the faces fit closely when the shell is expanded to normalsize. The several forms of shafts operate alike, those with reversethreads of course accelerating the movements of the segments.

Having described our invention, what we claim as new is I 1. Acontractible core bar including a threaded operating-shaft, a shelldivided into segments, a plurality of spiders mounted on the shaft,means connecting the segments operatively to the spiders whereby when'the shaft is rotated in the spiders the segments will be actuated, aplurality of threaded webs mounted on the shaft adjacent to the spiders,and operative means connecting the segments with the webs.

2. A contractible core bar including a threaded operating-shaft, a shelldivided into segments provided with inclined operative faces, spidersmounted on the shaft and having inclined operative faces engaging theoperative faces of the shell segments, and threaded webs mounted on theshaft adjacent to the spiders and having operative connection with theshell-segments.

3. A contractible core bar including a threaded operating-shaft, a shelldivided into segments provided with spreaders having inclined operativefaces differing in degrees of inclination, spiders mounted on the shaftand provided with arms having inclined operative ers being greater thanthat of the faces of other opposing spreaders, a plurality of spidersmounted on the shaft and provided with arms having inclined operativefaces difiering in degree of inclination to correspond with thedifferences of inclination of the faces of the spreaders, threaded websmounted on the thread of the shaft, devices engaging the webs wherebythe Webs may be prevented from rotating relatively to the shell, anddevices attached to the shell and engaging the webs and thereby holdingthe webs adjacent to the spreaders.

5. A contractible core-bar comprising a threaded operating-shaft, ashell divided into segments provided each with a plurality of spreaderseach having opposing inclined operative faces, a plurality of spidersmounted on the shaft and provided with a plurality of arms each havingopposing inclined opera tive faces, the operative faces at oppositesides of the shaft having a greater inclination than that of theoperative faces at other opposite sides of the shaft, threaded websmounted on the shaft adjacent to the spreaders, devices engaging thewebs whereby the Webs may be prevented from rotating relatively to theshell, and devices attached to the shell and engaging the Webs andthereby holding the webs adjacent to the spreaders.

6. A contractible core-bar comprising an operative shaft havingscrew-threads of different diameters, a shell divided into segmentsprovided with spreaders having inclined operative faces, threadedspiders mounted on the shaft and provided with arms having inclinedoperative faces, threaded webs mounted on the shaft adjacent to thespreader-s, and devices attached to the shell and engaging the webs andthereby holding the webs adjacent to the spreaders.

7. In a contractible core-bar, the combination of a threadedoperating-shaft, a shell divided into segments having each a pluralityof spreaders having inclined operative faces, a plurality of spidersmounted on the shaft and having arms on which are inclined operativefaces, two of which have a greater degree of inclination than theothers, the arms engaging the spreaders and adapted to contract andexpand the shell, threaded webs mounted on the shaft and adjacent to thespreaders, devices engaging the Webs whereby the webs may be preventedfrom rotating relatively to the shell, and devices attached to the shelland engaging the webs and there by holding the webs adjacent to thespreaders.

In testimony whereof we affix our signatures in presence of twowitnesses.

CHARLES E. CROSBY. EMIL o. AURIN.

Witnesses:

WM. H. PAYNE, E. T. SILVIUs.

